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FILE -- In this photo from files, taken on April 18, 2009, Italian neurologist and senator for life Rita Levi Montalcini, Nobel Prize winner for Medicine in 1986, is seen at a press conference for her one hundredth birthday, in Rome. Rome's mayor says biologist Rita Levi-Montalcini, who conducted underground research in defiance of Fascist persecution, and went on to win a Nobel Prize for helping unlock the mysteries of the cell, has died at her home in the city. She was 103. (AP Photo/Riccardo De Luca)

FILE -- In this photo from files, taken on April 18, 2009, Italian neurologist and senator for life Rita Levi Montalcini, Nobel Prize winner for Medicine in 1986, is seen at a press conference for her one hundredth birthday, in Rome. Rome's mayor says biologist Rita Levi-Montalcini, who conducted underground research in defiance of Fascist persecution, and went on to win a Nobel Prize for helping unlock the mysteries of the cell, has died at her home in the city. She was 103. (AP Photo/Riccardo De Luca)